Cylinder lock, especially for motor vehicles

Abstract

A cylinder lock, especially for motor vehicles, consisting of a rotor with tumblers, which is operatively connected with locking elements; with a key pulled off in the locking position, the tumblers engage in a tumbler channel provided in the inner wall of a stator receiving the rotor; a cut-in or groove constructed as intentional breaking or rupturing place is provided in the rotor adjoining the last tumbler, as viewed in the key insertion direction, which ruptures when a springily engaging locking action between the rotor and the stator not accessible from the outside has taken place during a forcible pulling out of the rotor.

We claim: 
     
       1. A cylinder lock, comprising rotor means having tumbler means which engage into at least one tumbler channel means provided in the inner wall of a stator means receiving the rotor means, when a key is pulled off in the locking position, said rotor means being operable to be connected with at least one locking element, characterized in that the rotor means is provided with an intentional rupturing place adjoining the last tumbler means, as viewed in the key insertion direction, which ruptures during a forcible pulling out of the rotor means, whereby an elastically engaging locking not accessible from the outside takes place between the rotor and stator means, characterized in that said elastically engaging locking is facilitated through the use of resiliently engaging locking means comprising at least one guided bolt means which, when the rotor is pulled out, initially contacts an inlet bevel, then yields resiliently, and finally engages an associated recess. 
     
     
       2. A cylinder lock according to claim 1, characterized in that the cylinder lock is for motor vehicles. 
     
     
       3. A cylinder lock according to claim 1, characterized in that the intentional rupturing place is constructed as a circumferentially extending cut-in. 
     
     
       4. A cylinder lock according to claim 1, characterized in that the intentional rupturing place in the rotor means is formed proximate to said inlet bevel and said associated recess is positioned in said stator means. 
     
     
       5. A cylinder lock according to claim 4, characterized in that said at least one bolt means is spring-loaded by one of coil compression springs, spring clip means connecting the two bolt means or a ring of elastic material. 
     
     
       6. A cylinder lock according to claim 4, characterized in that a cylinder section adjoins the intentional rupturing place in the rotor means, said cylinder section having said at least one bolt means positioned therein and being elastically forced in the outward direction projecting beyond the outer surface of said cylinder section, whereby an inclined butting surface is coordinated to said at least one bolt means on the stator side which terminates in an associated recess. 
     
     
       7. A cylinder lock according to claim 4, 5 or 6, characterized in that proximate the locking means formed by said at least one bolt means and said associated recess, the non-removable part of the rotor means includes a profile section which in the course of the displacement of the rotor engages in a correspondingly constructed area of the stator means. 
     
     
       8. A cylinder lock according to claim 7, characterized in that the profile section is in the shape of a polygon.